The Murphy Builders Site

My Rebel ( read Bob Johnson's original #652 ) has taken to the air for
the first time from the water. Since we put the floats on I have had a
problem with high oil temps. They are running as high as 225 in climb
and even at 2200 rpm cruise they are around 215. With the floats you
expect higher temps because of the lower speeds and higher work load on
the engine but these are still too high running at 2300 rpm.OAT's were
running around 24 so not really hot - yet. I have an 0-320 H engine. All
lines to the oil cooler are good. We have checked the timing ( cause of
earlier high temps) and the oil temp guage itself. Both are fine.The
CHT's are running under 400 except for #2 which is running just over
400. EGT's are all close to 1200. Most 0-320 Cessna's use a 4" hose to
the cooler and GIWH has a 3". Also we may open up the bottom end of the
cowling to get more air flow. Any ideas?

Neil Hardie







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To me 215 is perfect (but I don't get much support on that opinion around
here)! Water boils at 212! 225 in climb is getting warm, but not uncommon
or dangerous. You're right though it's only going to get higher on a day
like today or yesterday that hit 32. Your CHT's sound good although I do
shoot for 350 to 375...but will take up to 425 continuous in cruise. If I
remember right Bob had a Vernatherm issue once with it sticking open..ie
when heated it didn't lengthen and plug the hole and force oil thru the
cooler...so that's another thing to check (and I may have the person
wrong,,,,but it was someone here).

Oil cooler orientation is another variable as to how well it cools as well,
and how many kinks are in the 3" scat hose getting to it. Do the cowl bottom
doors have a lip on them? If not try giving them a bend down. Did that on
mine when I had the O-235 in it with no cooler that ran 235/245 everyday
without skipping a beat. The lip dropped the temps about 10*F

Wayne

----- Original Message -----
From: "Neil Hardie" <nhardie@lincsat.com>
To: <rebel-builders@dcsol.com>
Sent: Monday, June 06, 2005 5:06 PM
Subject: High temps

** Check your subject, does it still reflect the message? **

My Rebel ( read Bob Johnson's original #652 ) has taken to the air for
the first time from the water. Since we put the floats on I have had a
problem with high oil temps. They are running as high as 225 in climb
and even at 2200 rpm cruise they are around 215. With the floats you
expect higher temps because of the lower speeds and higher work load on
the engine but these are still too high running at 2300 rpm.OAT's were
running around 24 so not really hot - yet. I have an 0-320 H engine. All
lines to the oil cooler are good. We have checked the timing ( cause of
earlier high temps) and the oil temp guage itself. Both are fine.The
CHT's are running under 400 except for #2 which is running just over
400. EGT's are all close to 1200. Most 0-320 Cessna's use a 4" hose to
the cooler and GIWH has a 3". Also we may open up the bottom end of the
cowling to get more air flow. Any ideas?

Neil Hardie







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My Rebel ( read Bob Johnson's original #652 ) has taken to the air for
the first time from the water. Since we put the floats on I have had a
problem with high oil temps. They are running as high as 225 in climb
and even at 2200 rpm cruise they are around 215. With the floats you
expect higher temps because of the lower speeds and higher work load on
the engine but these are still too high running at 2300 rpm.OAT's were
running around 24 so not really hot - yet. I have an 0-320 H engine. All
lines to the oil cooler are good. We have checked the timing ( cause of
earlier high temps) and the oil temp guage itself. Both are fine.The
CHT's are running under 400 except for #2 which is running just over
400. EGT's are all close to 1200. Most 0-320 Cessna's use a 4" hose to
the cooler and GIWH has a 3". Also we may open up the bottom end of the
cowling to get more air flow. Any ideas?

Neil Hardie







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Thanks Wayne all good stuff as usual. Notice how I got this out before
you went north!
You got the right Bob - I will check with him about the Vernatherm and
maybe not get so uptight about uptemp!!

Neil








-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of
Wayne G. O'Shea
Sent: Monday, June 06, 2005 5:41 PM
To: rebel-builders@dcsol.com
Subject: Re: High temps


** Check your subject, does it still reflect the message? **

To me 215 is perfect (but I don't get much support on that opinion
around here)! Water boils at 212! 225 in climb is getting warm, but not
uncommon or dangerous. You're right though it's only going to get higher
on a day like today or yesterday that hit 32. Your CHT's sound good
although I do shoot for 350 to 375...but will take up to 425 continuous
in cruise. If I remember right Bob had a Vernatherm issue once with it
sticking open..ie when heated it didn't lengthen and plug the hole and
force oil thru the cooler...so that's another thing to check (and I may
have the person wrong,,,,but it was someone here).

Oil cooler orientation is another variable as to how well it cools as
well, and how many kinks are in the 3" scat hose getting to it. Do the
cowl bottom doors have a lip on them? If not try giving them a bend
down. Did that on mine when I had the O-235 in it with no cooler that
ran 235/245 everyday without skipping a beat. The lip dropped the temps
about 10*F

Wayne

----- Original Message -----
From: "Neil Hardie" <nhardie@lincsat.com>
To: <rebel-builders@dcsol.com>
Sent: Monday, June 06, 2005 5:06 PM
Subject: High temps

** Check your subject, does it still reflect the message? **

My Rebel ( read Bob Johnson's original #652 ) has taken to the air for

the first time from the water. Since we put the floats on I have had a

problem with high oil temps. They are running as high as 225 in climb
and even at 2200 rpm cruise they are around 215. With the floats you
expect higher temps because of the lower speeds and higher work load
on the engine but these are still too high running at 2300 rpm.OAT's
were running around 24 so not really hot - yet. I have an 0-320 H
engine. All lines to the oil cooler are good. We have checked the
timing ( cause of earlier high temps) and the oil temp guage itself.
Both are fine.The CHT's are running under 400 except for #2 which is
running just over 400. EGT's are all close to 1200. Most 0-320
Cessna's use a 4" hose to the cooler and GIWH has a 3". Also we may
open up the bottom end of the cowling to get more air flow. Any ideas?

Neil Hardie







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Hey Neil, One other thing to do is make sure that you have faired the lip of
the firewall. About 2" up on the firewall gave me almost 15deg f. ya gotta
keep the airflow smooth going out too. The other thing is, where are your
thermocouples? under the plugs or cylinder probes aka factory style. If under
the bottom plugs you cht reading is almost 40 high. Under the top plugs is 40ish
low from the probe readings. Longeze guys showed me that. Good luck, Curt
N97MR




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Hi Curt are you based at KPTK in "S" row?

Rebflyer@aol.com wrote:** Check your subject, does it still reflect the message? **

Hey Neil, One other thing to do is make sure that you have faired the lip of
the firewall. About 2" up on the firewall gave me almost 15deg f. ya gotta
keep the airflow smooth going out too. The other thing is, where are your
thermocouples? under the plugs or cylinder probes aka factory style. If under
the bottom plugs you cht reading is almost 40 high. Under the top plugs is 40ish
low from the probe readings. Longeze guys showed me that. Good luck, Curt
N97MR




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Hi Neil
My Rebel also on floats hade the same problem last summer.
Oil temps up to 230 cht around 395.
I went to a 4 door style cowl over the winter.
What I found though was there was no baffle behind the fly wheel so the
positive air pressure would go out there instead of forcing it through the
engine or oil cooler.
If I had of seen this first it may have saved me allot of work.
not sure if this helps.
good luck
Cecil 014R

----- Original Message -----
From: "Neil Hardie" <nhardie@lincsat.com>
To: <rebel-builders@dcsol.com>
Sent: Monday, June 06, 2005 4:06 PM
Subject: High temps

** Check your subject, does it still reflect the message? **

My Rebel ( read Bob Johnson's original #652 ) has taken to the air for
the first time from the water. Since we put the floats on I have had a
problem with high oil temps. They are running as high as 225 in climb
and even at 2200 rpm cruise they are around 215. With the floats you
expect higher temps because of the lower speeds and higher work load on
the engine but these are still too high running at 2300 rpm.OAT's were
running around 24 so not really hot - yet. I have an 0-320 H engine. All
lines to the oil cooler are good. We have checked the timing ( cause of
earlier high temps) and the oil temp guage itself. Both are fine.The
CHT's are running under 400 except for #2 which is running just over
400. EGT's are all close to 1200. Most 0-320 Cessna's use a 4" hose to
the cooler and GIWH has a 3". Also we may open up the bottom end of the
cowling to get more air flow. Any ideas?

Neil Hardie







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G'day Neil ...

I had HOT temps on both oil & all cylinder heads - constantly
....... then when we retro fitted an IO-320 we made the OUTLET area of
the cowl MUCH bigger - now EVERYTHING runs COOL !

Rick & Wendy Harper
541R

(in HOT OZ)
----- Original Message -----
From: british thunder
To: rebel-builders@dcsol.com
Sent: Wednesday, June 08, 2005 5:45 AM
Subject: Re: High temps


** Check your subject, does it still reflect the message? **

Hi Neil
My Rebel also on floats hade the same problem last summer.
Oil temps up to 230 cht around 395.
I went to a 4 door style cowl over the winter.
What I found though was there was no baffle behind the fly wheel so
the
positive air pressure would go out there instead of forcing it through
the
engine or oil cooler.
If I had of seen this first it may have saved me allot of work.
not sure if this helps.
good luck
Cecil 014R

----- Original Message -----
From: "Neil Hardie" <nhardie@lincsat.com>
To: <rebel-builders@dcsol.com>
Sent: Monday, June 06, 2005 4:06 PM
Subject: High temps

** Check your subject, does it still reflect the message? **

My Rebel ( read Bob Johnson's original #652 ) has taken to the air

for

the first time from the water. Since we put the floats on I have had

a

problem with high oil temps. They are running as high as 225 in

climb

and even at 2200 rpm cruise they are around 215. With the floats you
expect higher temps because of the lower speeds and higher work load

on

the engine but these are still too high running at 2300 rpm.OAT's

were

running around 24 so not really hot - yet. I have an 0-320 H engine.

All

lines to the oil cooler are good. We have checked the timing (

cause of

earlier high temps) and the oil temp guage itself. Both are fine.The
CHT's are running under 400 except for #2 which is running just over
400. EGT's are all close to 1200. Most 0-320 Cessna's use a 4" hose

to

the cooler and GIWH has a 3". Also we may open up the bottom end of

the

cowling to get more air flow. Any ideas?

Neil Hardie







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I cured high oil temps on my plane by moving the oil cooler to the rear
baffle ( check an early model cherokee for guidance ) Opening the cowl exit
by cutting it back about a foot on each side of the air box then riveting
new peices in shaped to increase the outlet hieght by about an inch and a
half. I also wrapped the exhaust with ceramic header tape from a speed shop
to cut down on heat off the exhaust. The biggest improvement was moving the
oil cooler.
My engine is an 0-290D and on the hottest days of summer on floats I see
oil temps around 190 degrees running at 2500rpm most of the time. In the
winter I have to fully block the oil cooler and I'm lucky if I can get up
to 160.

My Rebel ( read Bob Johnson's original #652 ) has taken to the air for
the first time from the water. Since we put the floats on I have had a
problem with high oil temps. They are running as high as 225 in climb
and even at 2200 rpm cruise they are around 215. With the floats you
expect higher temps because of the lower speeds and higher work load on
the engine but these are still too high running at 2300 rpm.OAT's were
running around 24 so not really hot - yet. I have an 0-320 H engine. All
lines to the oil cooler are good. We have checked the timing ( cause of
earlier high temps) and the oil temp guage itself. Both are fine.The
CHT's are running under 400 except for #2 which is running just over
400. EGT's are all close to 1200. Most 0-320 Cessna's use a 4" hose to
the cooler and GIWH has a 3". Also we may open up the bottom end of the
cowling to get more air flow. Any ideas?

Neil Hardie

Drew





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Should have bought baffle's from Van's. There is a seal behind the fly
wheel.
Works for me.

Murray





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Yup, that's me!!!
Stop and say hi. Curt




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